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73533 Zip Code (Duncan, OK) Detailed Profile. Cities: Duncan, OK (10.67%), Central High, OK (4.77%), Empire City, OK (2.28%), Bray, OK (1.08%), Marlow, OK (0.00%), Velma, OK (0.00%) Counties: Stephens County, OK (98.70%), Cotton County, OK (1.30%)
Zip Code 73503 Description. Zip Code 73503 is located in the state of Oklahoma in the Wichita Falls metro area. Zip code 73503 is primarily located in Comanche County. The official US Postal Service name for 73503 is FORT SILL, Oklahoma. Portions of zip code 73503 are contained within or border the city limits of Lawton, OK, Medicine Park, OK, .